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    <title>Document</title>
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        h3~p{
            color: red;
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<body>
    <P>不让</P>
    <h3>我是标题</h3>
    <P>我是内容1</P>
    <P>我是内容2</P>
    <div>哈哈哈</div>
    <P>我是内容3</P>
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